Datasheet

R
f
R
(g)
R
(g)
R
f
_
+
Differential Amplifier
V
OCM
_
+
_
+
V
CC+
V
IN−
V
IN+
V
O+
V
O−
THS413x
Fully differential Amplifier
V
CC−
Input voltage definition V
ID
+
ǒ
V
I)
Ǔ
–
ǒ
V
I–
Ǔ
V
IC
+
ǒ
V
I)
Ǔ
)
ǒ
V
I–
Ǔ
2
Output voltage definition V
OD
+
ǒ
V
O)
Ǔ
–
ǒ
V
O–
Ǔ
V
OC
+
ǒ
V
O)
Ǔ
)
ǒ
V
O–
Ǔ
2
Transfer function V
OD
+ V
ID
x A
ǒ
f
Ǔ
Output common mode voltage V
OC
+ V
OCM
V
OCM
_
+
_
+
V
CC+
V
IN−
V
IN+
V
O+
V
O−
Differential Structure Rejects
Coupled Noise at The Output
Differential Structure Rejects
Coupled Noise at The Input
Differential Structure Rejects
Coupled Noise at The Power Supply
V
CC−
THS4130
THS4131
www.ti.com SLOS318H –MAY 2000– REVISED MAY 2011
PRINCIPLES OF OPERATION
THEORY OF OPERATION
The THS413x is a fully-differential amplifier. Differential amplifiers are typically differential in/single out, whereas
fully-differential amplifiers are differential in/differential out.
Figure 35. Differential Amplifier Versus a Fully-Differential Amplifier
To understand the THS413x fully-differential amplifiers, the definition for the pin outs of the amplifier are
provided.
(7)
(8)
(9)
(10)
Figure 36. Definition of the Fully-Differential Amplifier
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